Key points
- IP code from IEC 60529: first digit for solids and dust (0–6), second for water (0–9); X replaces a digit that is not required to be specified.
- IEC 60364-4-41: circuits for mobile equipment used outdoors up to 32 A need additional protection by an RCD of no more than 30 mA.
- In our climate dust matters; choose a suitable first digit, not just water protection.
- Outdoor and buried wiring is licensed electrician work under the Saudi Electrical Code SBC 401.
Electrics outside the house face what indoor ones do not: dust and storms, rain and spray from washing and irrigation, and strong sun. A fitting that simply "works" is not enough; its enclosure must suit the location and the circuit must be protected.
1) How to read an IP rating
The IP code (degree of protection provided by an enclosure) is defined in IEC 605291:
- First digit (0–6): protection against solid objects and dust.
- Second digit (0–9): protection against water; for example 4 splashing, 5 water jets, 7 temporary immersion2 up to 1 m1.
- X replaces a digit that is not required to be specified; it does not mean there is no protection (no protection is 0)2.
The full second-digit table is in bathroom electrics.
| Location | Exposure | What to ask for (practical advice) |
|---|---|---|
| Facade under an overhang | Dust, occasional driven rain | Water digit 4 or more, with a suitable dust digit |
| Open yard washed with a hose | Water jets and dust | Water digit 5 or 6 |
| Ground lights or in planters | Standing water, irrigation, possible immersion | Water digit 7 if immersion is possible |
| Inside a pool or fountain | Permanent immersion | Water digit 8 per the maker's conditions, and specialist installation |
The table is practical advice based on the meaning of the IEC 60529 digits; the manufacturer's instructions and the installation location are the reference.
2) RCDs for outdoor circuits
IEC 60364-4-41 requires additional protection by an RCD of no more than 30 mA for circuits supplying mobile equipment used outdoors up to 32 A3, and for general-use socket circuits (up to 32 A in the current edition, as quoted in Schneider's guide)4. In Saudi Arabia the binding reference is the Saudi Electrical Code SBC 4015. See breakers and RCDs.
3) Common mistakes
- Ordinary indoor cable run exposed to the sun on the roof or boundary wall.
- Junction boxes without covers, or with open knockouts letting in dust and water.
- An ordinary indoor socket in the yard instead of a covered outdoor socket.
- Ground lights where irrigation water collects, without a suitable immersion rating.
- An outdoor circuit without an RCD, or an RCD whose test button has never been pressed.
These are common practical observations. Outdoor and buried wiring is licensed electrician work. See also wires and cables and electrical problems.
4) Before installing
- What is the fitting's IP rating, and does it suit the location (dust, spray, immersion)?
- Is the outdoor circuit protected by a 30 mA RCD?
- What cable and route, and is it protected from sun and damage?
- Are outdoor sockets covered, and mounted above where water collects?
- Is the lighting controlled by a timer or sensor to save power?
Sources
The number next to a statement points to its source in this list. Sources back the general information; anything marked “practical advice” is editorial experience, not a quoted source. Anything that affects safety, structural design or electrical installations needs a licensed professional, and in Saudi Arabia the binding reference is the Saudi Building Code.
- 1IEC 60529 — Degrees of protection provided by enclosures (IP Code) — Applus+ Keystone
- 2Protection provided for enclosed equipment: codes IP and IK — Electrical Installation Guide (Schneider Electric) — Chapter E
- 3IEC 60364-4-41 — Protection against electric shock — IEC — copy published via iTeh Standards
- 4Additional protection: High sensitivity RCDs — Electrical Installation Guide (Schneider Electric)
- 5Saudi Electrical Code SBC 401 — code requirements (based on IEC 60364 with local amendments) — Saudi Building Code National Committee